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Sludge in fetal gallbladder: natural history and neonatal outcome
B Petrikovsky1, V Klein, N Holsten
1North Shore University Hospital, NYU School of Medicine, Division of Maternal Fetal Medicine, Manhasset 11030, USA.
Insights
Fetal gallbladder sludge, a rare finding, appears as echogenic structures on ultrasound. This condition is benign and resolves naturally in infants, similar to fetal gallstones.
Area of Science:
- Perinatology
- Medical Imaging
- Gastroenterology
Background:
- Fetal gallbladder abnormalities are increasingly detected via ultrasound.
- Fetal gallstones are the most common abnormality.
- Gallbladder sludge is a less common, but significant, finding.
Purpose of the Study:
- To describe the ultrasound appearance and natural history of fetal gallbladder sludge.
- To differentiate gallbladder sludge from other fetal abdominal findings.
- To assess the clinical significance and outcomes of fetal gallbladder sludge.
Main Methods:
- Retrospective review of five fetal cases with gallbladder sludge identified by ultrasound.
- Serial ultrasound examinations during gestation.
- Postnatal abdominal ultrasound follow-up in affected infants.
Main Results:
- Gallbladder sludge presented as pear-shaped echogenic structures, often mimicking intrahepatic calcification or echogenic bowel.
- Fetal growth was normal in all cases.
- Postnatal follow-up revealed resolution of gallbladder sludge in all evaluated infants by 12 weeks of life.
Conclusions:
- Fetal gallbladder sludge is a benign condition with a favorable natural history.
- Accurate prenatal diagnosis of gallbladder sludge can prevent unnecessary investigations and parental anxiety.
- The condition typically resolves spontaneously after birth, similar to fetal gallstones.
Abstract:
Normal and pathological conditions of the fetal gallbladder have been a subject of recent investigation by ultrasonographers. Fetal gallstones are the most common abnormal finding and appear as echogenic foci within the gallbladder. We report a series of five fetuses in whom the gallbladders were filled with sludge which appeared as a pear shape echogenic structure. In the majority of cases, gallbladder sludge mimicked intrahepatic calcification or echogenic bowel. Serial ultrasound examinations of these fetuses revealed good interval growth. The gallbladders remained echogenic and were normal in size in three cases and were moderately enlarged in two. All neonates were born in normal condition with no identifiable malformations. Follow-up was obtained in four infants using abdominal ultrasound. A normal appearing sludge free gallbladder was seen in three neonates at 6 weeks of life and in four infants at 12 weeks. Accurate diagnosis of gallbladder sludge will spare the patient unnecessary work-up and anxiety. The natural history of gallbladder sludge in the fetus is benign in nature and is similar to that of fetal gallstones.